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Questions  >>  Olympiad-Math  >>  Class 10
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If x=rsinθcosϕ,y=sinθsinϕ, and z=rcosθ, then

(A)x2+y2+z2=r2(B)x2+y2z2=r2(C)x2y2+z2=r2(D)z2+y2x2=r2
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